Ask HN: How have you gotten more paying customers?

What has and hasn't worked for you to acquire more paying customers?

Did you advertise more? Focus on a specific targeted audience or a particular platform?

Did you try to get more users in general to visit your site? Did you try to optimize things with analytics? A/B testing?

Referral incentives?

Did you hire someone or a firm?

Did you just try to make your product better? Or improve you brand?

Do you keep track of all this stuff, and if you do how?